Reloading ammunition requires attention to many critical cartridge dimensions, including case length, neck and base diameters, overall length, primer pocket depth, etc. Verifiying these dimensions is quick and convenient with the Frankford Arsenal Calipers and Micrometers. Calipers are accurate to within .001" and Micrometers are accurate to within .0001". The calipers allow you to measure inside and outside diameters, plus depths. They also include a data output socket for interface with your computer or printer. You will find them useful for many measuring tasks on and off the reloading bench. Packaged in a convenient, protective case.